Compute the weighted mean of values with individual weights or frequencies.
The weighted average multiplies each value by its corresponding weight, sums those products, and divides by the total weight. Unlike a simple mean, values with higher weights contribute more to the result.
Weighted Average
Weighted Average = Σ(value × weight) / Σ(weights)
Use it when values have different importance, frequency, or reliability. Common examples: GPA (credits as weights), portfolio returns (investment amounts as weights), and survey data (sample sizes as weights).
When all weights are equal, the weighted average reduces to the simple arithmetic mean.